创建堆栈时出现问题！(街机游戏）

我是C++的业余初学者，最近我有了重新制作流行街机游戏Stack的想法！在C++控制台中。当玩家必须放置垫子时，问题就会出现：这个pad放置得很好，但如果你犯了一个错误，它就不能正确地调整大小(当你运行代码时，你会更好地理解(。

不要在意有时会出错的图形，因为我可以自己修复。请帮帮我！

这是代码：

#include <iostream>
#include <stdio.h>
#include <cstdlib>
#include <windows.h> 
#include <string>
using namespace std;
bool bDirection = true;       /* Bool for the direction:
true = dx, false = sx */
string sPad;
int nPadLenght = 6;
int x = 40, y =21;            // Referement tile's  position
int nSpeed = 200;
bool loop = true;             // main loop
int nScore = 0;               // score
int nPlaceX = 40;                        
int nTileX = 35, nTileY = 20; // Player's actual postition
int nEndTileX, nEndTileY;
void RenderLine(int *x, int *y);
int main();
// Void for the coordinates
void gotoxy (int x, int y){
COORD coord;
coord.X = x ;
coord.Y = y ;
SetConsoleCursorPosition (GetStdHandle(STD_OUTPUT_HANDLE), coord);
}
void Victory(){
x = 10;
y = 4;
Beep(698.5, 300);
Beep(698.5, 100);
Beep(1047, 500);
system("color a");
gotoxy(x,y); cout << "You win!nn      Score = " << nScore;
system("pause >nul");

}

void PadLenght(int *x){
// Each number is equal to a possible pad lenght
switch (*x){
case 6:
sPad = "[][][]";
nEndTileX = nTileX + 5;
break;
case 5:
sPad = "[][]]";
nEndTileX = nTileX + 4;
break;
case 4:
sPad = "[][]";
nEndTileX = nTileX + 3;
break;
case 3:
sPad = "[][";
nEndTileX = nTileX + 2;
break;
case 2:
sPad = "[]";
nEndTileX = nTileX + 1;
break;
case 1:
sPad = "[";
nEndTileX = nTileX;
break;
}
}
void SwitchDirection(bool *x){
// Switches the bool of the direction
switch (*x){
case true:
*x = false;
break;
case false:
*x = true;
break;
}
}
void Speed(){
// For each line from 500ms to 20ms speed increments of 10ms
if (nSpeed > 20)
nSpeed -= 20;
}
// void for placing the pad
void Place() {
int i = nPlaceX - nTileX;
if (i < 0)
i * -1;
nPadLenght -= i;

}
void collision(){
// Collisions with the border
if (nTileX > 45 || nTileX < 35)
SwitchDirection(&bDirection);
}
void movement(){
int nLastX = nTileX;
// Place the pad if pressing down arrow
if(GetKeyState(VK_DOWN) & 0x8000){
nTileY--;
Place();
Speed();
Beep(698.5, 50);
Beep(880.0, 50);
Beep(1047, 50);
nScore += 10;
Sleep(60);
}
// Movement of the pad
switch (bDirection){
case true:
gotoxy (nLastX, nTileY); cout << "                          ";          
nTileX++;
break;
case false: 
gotoxy (nLastX - nPadLenght, nTileY); cout << "                ";                                
nTileX--;
break;
}

}

int main(){
system("color 0");
while (loop = true){
char a = '"';
gotoxy(x,y); cout << a << a << a << a << a << a;
collision();
PadLenght(&nPadLenght);
movement();
gotoxy (nTileX, nTileY); cout << sPad;
Sleep (nSpeed);
if (nScore > 160) {
Victory();
break;
}

}

return 0;
}